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Unformatted text preview: Hint) calculate the true area of cables when the necking occurs. 3. From a tensile test, the stress-strain relationship for material A was obtained as shown in Fig. 1. In the elastic region, the stress is linearly proportional to the stress and represented by = E with E=30,000,000 psi (207 GPa). Beyond the yield point, the material shows plastic deformation according to = K n Assuming that y =0.02, u =0.2, f =0.3, K=145,000 psi (1 GPa) and n=0.2, a) calculate toughness. b) calculate the modulus of resilience and estimate the hardness in Brinell and Rockwell C. 4. A bar 0.5 m long is stretched to the strain of 0.15 and then stress relieved. The yield stress of this material is 600 MPa and E=200 GPa. The plastic deformation is described by the strain hardening equation = K n with K=760 MPa and n=0.2. Determine the length of the bar after the external stress is relieved....
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This document was uploaded on 04/23/2011.
- Spring '09